Datasheet > LM2747

LM2747

更新时间： 2024-11-26 02:58:23

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
38页	1260K
描述
Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock Synchronization

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LM2747 数据手册

LM2747

www.ti.com

SNVS370B –MARCH 2006–REVISED MARCH 2013

LM2747 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock

Synchronization

Check for Samples: LM2747

FEATURES

DESCRIPTION

The LM2747 is a high-speed synchronous buck

regulator controller with a feedback voltage accuracy

of ±1%. It can provide simple down conversion to

output voltages as low as 0.6V. Though the control

section of the IC is rated for 3 to 6V, the driver

section is designed to accept input supply rails as

high as 14V. The use of adaptive non-overlapping

MOSFET gate drivers helps avoid potential shoot-

through problems while maintaining high efficiency.

The IC is designed for the more cost-effective option

of driving only N-channel MOSFETs in both the high-

side and low-side positions. It senses the low-side

switch voltage drop for providing a simple, adjustable

current limit.

•

±1% Feedback Voltage Accuracy Over

Temperature

•

Switching Frequency from 50 kHz to 1 MHz

Switching Frequency Synchronize Range 250

kHz to 1 MHz

•

Startup with a Pre-Biased Output Load

Power Stage Input Voltage from 1V to 14V

Control Stage Input Voltage from 3V to 6V

Output Voltage Adjustable Down to 0.6V

Power Good Flag and Shutdown

Output Overvoltage and Undervoltage

Detection

The LM2747 features a fixed-frequency voltage-mode

PWM control architecture which is adjustable from 50

kHz to 1 MHz with one external resistor. In addition,

the LM2747 also allows the switching frequency to be

synchronized to an external clock signal over the

range of 250 kHz to 1 MHz. This wide range of

switching frequency gives the power supply designer

the flexibility to make better tradeoffs between

component size, cost and efficiency.

•

Low-Side Adjustable Current Sensing

Adjustable Soft-Start

Tracking and Sequencing with Shutdown and

Soft Start Pins

•

14-Pin TSSOP Package

APPLICATIONS

•

Down Conversion from 3.3V

Cable Modem, DSL and ADSL

Laser Jet and Ink Jet Printers

Low Voltage Power Modules

DSP, ASIC, Core and I/O

Features include the ability to startup with a pre-

biased load on the output, soft-start, input

undervoltage lockout (UVLO) and Power Good

(based on both undervoltage and overvoltage

detection). In addition, the shutdown pin of the IC can

be used for providing startup delay, and the soft-start

pin can be used for implementing precise tracking, for

the purpose of sequencing with respect to an external

rail.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...38

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LM2747 替代型号

型号	品牌	替代类型	描述	数据表
LM3743	TI	功能相似	High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features
LM2743	TI	功能相似	LM2743 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller

与LM2747相关器件

型号	品牌	获取价格	描述	数据表
LM2747_15	TI	获取价格	Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock Synchronization
LM2747MTC	NSC	获取价格	Synchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization
LM2747MTC/NOPB	TI	获取价格	Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock Synchronization
LM2747MTCX	NSC	获取价格	Synchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization
LM2747MTCX/NOPB	TI	获取价格	Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock Synchronization
LM2748	TI	获取价格	LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock
LM2748	NSC	获取价格	Synchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization
LM2748MTC	NSC	获取价格	Synchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization
LM2748MTC	TI	获取价格	LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup
LM2748MTC/NOPB	TI	获取价格	LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup

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